﻿using System;
using System.Web;
using System.IO;
using System.Drawing;

namespace HOH
{
    /**//// <summary>
    /// VerifyCode 的摘要说明。
    /// </summary>
    public class VerifyCode
    {
        // Properties

        #region 验证码长度(默认4个验证码的长度)#region 验证码长度(默认4个验证码的长度)
        int length = 4;
        public int Length
        {
            get{ return length; }
            set{ length = value; }
        }
        #endregion

        #region 验证码字体大小(默认12像素)#region 验证码字体大小(默认12像素)
        int fontSize = 12;
        public int FontSize
        {
            get{ return fontSize; }
            set{ fontSize = value; }
        }
        #endregion

        #region 边框补(默认2像素)#region 边框补(默认2像素)
        int padding = 2;
        public int Padding
        {
            get{ return padding; }
            set{ padding = value; }
        }
        #endregion

        #region 是否输出燥点(默认不输出)#region 是否输出燥点(默认不输出)
        bool chaos = false;
        public bool Chaos
        {
            get{ return chaos; }
            set{ chaos = value; }
        }
        #endregion

        #region 输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
        Color chaosColor = Color.LightGray;
        public Color ChaosColor
        {
            get{ return chaosColor; }
            set{ chaosColor = value; }
        }
        #endregion

        #region 自定义背景色(默认白色)#region 自定义背景色(默认白色)
        Color backgroundColor = Color.White;
        public Color BackgroundColor
        {
            get{ return backgroundColor; }
            set{ backgroundColor = value; }
        }
        #endregion

        #region 自定义随机颜色数组#region 自定义随机颜色数组
        Color[] colors = {Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple};
        public Color[] Colors
        {
            get{ return colors; }
            set{ colors = value; }
        }
        #endregion

        #region 自定义字体数组#region 自定义字体数组
        string[] fonts = {"Arial", "Georgia"};
        public string[] Fonts
        {
            get{ return fonts; }
            set{ fonts = value; }
        }
        #endregion

        #region 自定义随机码字符串序列(使用逗号分隔)#region 自定义随机码字符串序列(使用逗号分隔)
        string codeSerial = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
        public string CodeSerial
        {
            get{ return codeSerial; }
            set{ codeSerial = value; }
        }
        #endregion

        #region 生成校验码图片#region 生成校验码图片
        /**//// <summary>
        /// 生成校验码图片
        /// </summary>
        /// <param name="code">已经生成的随机码</param>
        /// <returns>位图</returns>
        public Bitmap CreateImageCode(string code)
        {
            int fSize = FontSize;
            int fWidth  = fSize + Padding;

            int imageWidth  = (int)(code.Length * fWidth) + 4 + Padding * 2;
            int imageHeight  = fSize *2 + Padding;

            System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);

            Graphics g = Graphics.FromImage(image);

            g.Clear(BackgroundColor);

            Random rand = new Random();

            //给背景添加随机生成的燥点
            if(this.Chaos)
            {

                Pen pen = new Pen(ChaosColor, 0);
                int c = Length * 10;

                for(int i=0;i<c;i++)
                {
                    int x = rand.Next(image.Width);
                    int y = rand.Next(image.Height);

                    g.DrawRectangle(pen, x, y, 1, 1);
                }
            }

            int left = 0 , top = 0, top1 = 1, top2 = 1;

            int n1  = (imageHeight - FontSize - Padding * 2);
            int n2  = n1/4;
            top1  = n2;
            top2  = n2 *2;
   
            Font f;
            Brush b;

            int cindex, findex;

            //随机字体和颜色的验证码字符
            for(int i=0; i<code.Length; i++)
            {
                cindex = rand.Next(Colors.Length - 1);
                findex = rand.Next(Fonts.Length - 1);
                
                f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
                b = new System.Drawing.SolidBrush(Colors[cindex]);

                if( i%2 == 1 )
                {
                    top = top2;
                }
                else
                {
                    top = top1;
                }

                left = i * fWidth;

                g.DrawString(code.Substring(i,1), f, b, left, top);
            }

            //画一个边框
            g.DrawRectangle(new Pen(Color.Black,0), 0, 0, image.Width-1, image.Height-1);

            g.Dispose();

            return image;
        }
        #endregion

        #region 将创建好的图片输出到页面#region 将创建好的图片输出到页面
        /**//// <summary>
        /// 将创建好的图片输出到页面
        /// </summary>
        /// <param name="code">已经生成的随机码</param>
        /// <param name="context">Web上下文</param>
        public void CreateImageOnPage(string code, HttpContext context)
        {
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            Bitmap image = this.CreateImageCode(code);

            image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

            context.Response.ClearContent();
            context.Response.ContentType = "image/Jpeg";
            context.Response.BinaryWrite(ms.GetBuffer());

            ms.Close();
            ms = null;
            image.Dispose();
            image = null;
        }
        #endregion

        #region 生成随机字符码#region 生成随机字符码
        /**/
        /// <summary>
        /// 生成随机字符码
        /// </summary>
        /// <param name="codeLen">随机码长度</param>
        /// <returns>产生的随机码</returns>
        public string CreateVerifyCode(int codeLen)
        {
            if(codeLen == 0)
            {
                codeLen = Length;
            }

            string[] arr = CodeSerial.Split(',');

            string code = "";

            int randValue = -1;

            Random rand = new Random(unchecked((int)DateTime.Now.Ticks));

            for(int i=0; i<codeLen; i++)
            {
                randValue = rand.Next(0, arr.Length -1);

                code += arr[randValue];
            }

            return code;
        }
        public string CreateVerifyCode()
        {
            return CreateVerifyCode(0);
        }
        #endregion

    }
}
